Title :
Nyquist-Stability-Criterion-Based SSR Explanation for Type-3 Wind Generators
Author :
Fan, Lingling ; Miao, Zhixin
Author_Institution :
Dept. of Electr. Eng., Univ. of South Florida, Tampa, FL, USA
Abstract :
Type-3 wind generators in series-compensated networks could lead to subsynchronous resonance (SSR) oscillations- a phenomenon observed recently. In this letter, impedance-based Nyquist stability criterion is applied to explain the phenomenon. The resonance is not due to the shaft´s torsional characteristics, but rather due to its slip related impedance, which can give rise to equivalent negative resistance. The explanation corroborates the authors´ previous explanation of self-excitation using net negative resistance concept. Nyquist map is also able to demonstrate the impact of wind speed on SSR.
Keywords :
Nyquist stability; slip (asynchronous machines); subsynchronous resonance; wind power plants; Nyquist stability criterion; SSR; equivalent negative resistance; net negative resistance concept; series compensated networks; shaft torsional characteristics; slip related impedance; subsynchronous resonance oscillations; type-3 wind generators; wind speed; Generators; Impedance; Power system stability; Resistance; Stability criteria; Wind speed; Doubly fed induction generator (DFIG); subsynchronous resonance (SSR); wind generation;
Journal_Title :
Energy Conversion, IEEE Transactions on
DOI :
10.1109/TEC.2012.2193491
